Belt drive for spindles of spinning or twisting machines



1964 F. STAHLECKER ETAL' 3,120,732

BELT DRIVE FOR SPINDLES OF SPINNING OR TWISTING MACHINES Filed June 8,1962 9 Sheets-Sheet 1 I! iilii I II 7511111111111 II II INVENTORS FmrzSTHi/LEC KER HTMRNEYS 1964 F. STAHLECKER ETAL BELT DRIVE FOR SPINDLES 0FSPINNING 0R TWISTING MACHINES Filed June 8, 1962 9 Sheets-Sheet 2 F/G./a

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Fmrz STFI/ILECKER HHN s 5 THHLECKER BwQAQLJQA flrroRA/EYS F 1964 F.STAHLECKER ETAL BELT DRIVE FOR SPINDLES OF SPINNING OR TWISTING MACHINESFiled June 8, 1962 9 Sheets-Sheet 3 /NVENTO/PS FRITZ STHHLECKER HfllvsSTHHLECKER 8Y- Ml RTTORNEYS Feb. 11, 1964 F. STAHLECKER ETAL BELT DRIVEFOR SPINDLES OF SPINNING 0R TWISTING MACHINES Filed June 8, 1962 9Sheets-Sheet 4 Fmrz STHIILHZKER Hnns s-rnu LECKER BY- MMQ HTTAR NEYS1964 F. STAHLECKER ETAL' 3,

BELT DRIVE FOR SPINDLES OF SPINNING 0R TWISTING MACHINES Filed June 8,1962 9 Sheets$heet 5 l/w twrops STr-zHLEaKm HTToRNEK 11, 1964 F.STAHLECKER ETAL 3,120,732

BELT DRIVE F OR SPINDLES 0F SPINNING 0R TWISTING MACHINES Filed June 8,1962 9 Sheets-Sheet 6 FRITZ QTHHLECKER H nus Srm/z EOKEI? F. STAHLECKERETAL Feb. 11, 1964 3,120,732

BELT DRIVE FOR SPINDLES 0F SPINNING 0R TWI STING MACHINES I Filed June8, 1962 9 Sheets-Sheet 7 llvrewmes FRITZ STHHLECKER HFms STHH LEcKER BZQQ/QVaMQ 1964 F. STAHLECKER ETAL 3,120,732

BELT DRIVE FOR SPI NDLES OF SPINNING OR TWISTING MACHINES Filed June 8,1962 9 Sheets$heet 8 42/ as I all l/vnwraes FRITZ STHHLECKER HrmsSTHHLECKER BY MAQQ' HTTORNEYS Feb. 1964 F. STAHLECKER ETAL 3,120,732

BELT DRIVE FOR SPINDLES OF SPINNING OR TWISTING MACHINES Filed June 8,1962 9 Sheets-Sheet 9 /NVENTOIPS FRITZ STHIILEKER HnNs 8TH H LEG/(ERflTToRNEYS United States Patent 3,120,732 BELT DRIVE FUR SPINDLES OFSPINNING 0R TWISTING MACHINES Fritz Stahlecker, Botzgensteige, BadUherkingen, and Hans Stahlecker, I-Ialdenstrasse 20, Sussen, both ofWurttemberg, Germany Filed June 8, 1962, Ser. No. 201,083 Claimspriority, application Germany June 9, 1961 15 Claims. (Cl. 57105) Thepresent invention relates to a belt or string drive for the spindles ofspinning or twisting machines of the type which the belt or string foreach spindle is driven by a separate drive pulley which is mountedclosely adjacent to the spindle, and in which this belt or string(hereafter collectively referred to as a belt) which consequently is :ofa short length is guided by a guide pulley and a tension pulley, andwherein the tension-pulley holder is slidable on a slideway and pressedagainst the latter by the tension of the belt and the tension exerted bya spring, weight or similar means.

In one prior device of this kind, each tension pulley was slidablymounted on a separate slide member, while in another prior device eachtension pulley and its tension means together with the guide pulley weremounted on a common support which was secured to the spindle rail bymeans of the housing of the spindle bearing and the mounting nut of therespective spindle. Although these prior devices have proved to bepractical in the production of machines with frequently changingdistances between their spindles, their production is very uneconomicalif it concerns larger series of machines in which the spindles arespaced at a uniform distance from each other.

It is therefore an object of the present invention to provide a beltdrive of the general type as mentioned in the beginning which may bebuilt more economically and with greater technical advantages than thedevices mentioned above and which is especially suitable for theproduction of a greater number of spinning or twisting machines in whichthe spindles are spaced at a uniform distance from each other. Forattaining this object, the invention provides that the machine may beassembled of a number of equal units, each of which contains a certainnumber of spindles forming a group with separate drive, guide andtension pulleys, and that the slideways for the tension-pulley holdersof each group are mounted on a common rail which extends in thelongitudinal direction of the machine. This mounting rail may bedesigned so as to serve itself as a slideway for the tension-pulleyholders. This is especially of advantage if the tension-pulley holdersare not provided with lateral guiding means but are guided on theirslideways merely by being pressed thereon, for example, by springs,weights or similar means which also serve as the belt-tension means.

The mounting rail may also be made, for example, in the form of an anglerail which may then also serve as a support on which the guide-pulleyholders are mounted. The mounting rail according to the invention mayfurthermore be utilized for securing thereon the means for stopping thespindles, for example, belt lifting'brakes.

Another feature of the invention consists in designing thetension-pulley holders so that each of them is slidable on the mountingrail along a circular path about a pivot which is directly connected tothe mounting rail. The tension springs for these pulley holders may thenbe connected to an angle rail or bar which is secured to the mountingrail.

For pressing the tension-pulley holders slidably upon the mounting rail,the latter is preferably provided with apertures through which thetension springs extend from one to the other side of the rail. Theseapertures may also be formed by dividing the mounting rail into severalparallel longitudinal parts. The lower longitudinal rail part to whichthe tension springs are connected may then also be made adjustablerelative to the other par-ts so as to permit the tension of the springsto be adjusted.

The mounting rail may be secured, for example, by being bolted to arms.or brackets which are mounted on or integral with the spindle rail orthe bearing housings of the drive shaft which extends in thelongitudinal direction of the machine.

A very advantageous feature of the invention further consists indesigning the mounting rail so as to be pivotable, for example, about ahorizontal axis which is disposed underneath the drive shaft. T hespindles are then more easily accessible and the sliding means as wellas other parts which are connected to the mounting rail, for example,the guide pulleys and spindles brakes, may also be more easily serviced.

The accessibility to the spindles and other parts in the vicinitythereof may be still further improved by designing the mounting rail soas to be pivotable about an axis which is disposed above the driveshaft. If the swivel axis of sucha mounting rail is located in theproper position, it is even possible to swing the rail upwardly withoutdisplacing the belt from its driving, tension and guide pulleys. Thesame result may also be attained if, instead of suspending the mountingrail on fixed pivots, it is pivotable about a lever bearing.

According to another embodiment of the invention, the mounting rail maybe connected to and form a part of the boxlike housing which fully orpartly encloses the spindle drive.

It is one particular advantage of the invention that it permits themounting rail for the slide and tension means of a group of tensionpulleys to be combined with the associated belt guiding means to form astructural unit which may be easily installed in or, if necessary,removed from the machine. In certain cases it is even possible andadvisable to extend this unit so as also to include the two drive-shafthearings to which the mounting rail is secured, as well as a section ofthe drive shaft which is mounted in these bearings and carries the drivepulleys.

The objects, features, and advantages of the present invention willbecome more clearly apparent from the following detailed descriptionthereof which is, to be read with reference to the accompanyingdrawings, in which I FIGURE 1 shows a cross section of a one-spindlebelt drive with a mounting rail according to the invention and aseparate slideway thereon;

FIGURE 1a is a cross-sectional view through a onespindle hand drive witha rail in accordance with the present invention, serving as a slidewayfor a group of tension pulley holders, whereby the means for arrestingthe spindle are provided on the rail and'the holders for the reversingpulleys are arranged on a further attachment rail;

FIGURE 2 shows a similar cross section of a one.- spindle belt drive, inwhich the mounting rail' is secured to arms which are integral with thebearing housing of the drive shaft, and in which the mounting railitself forms the slideway for the tension-pulley holders and alsocarries the guideapulley holders;

FlGURE 3 shows a diagrammatic longitudinal view of a mounting rail whichis secured to two shaft-bearing housings, while for the sake ofclearness of this illustration the apertures in the rail as well asother parts of the apparatus are only partly indicated;

FIGURE 4 shows a front view of a part of a mounting rail which isprovided with an additional longitudinal rail and with tension-pulleyholders which are pivotably mounted on the mounting rail so as to beslidable thereon along a circular path;

FIGURE shows a cross section taken along line V--V of FIGURE 4;

FIGURE 6 shows a cross section of an embodiment of the invention similarto FIGURE 2, in which, however, the mounting rail consists of twoparallel longitudinal parts;

FIGURE 7 shows a cross section of another modification of the invention,in which the mounting rail is pivotable about a horizontal axis which isdisposed underneath the drive shaft;

FIGURE 8 shows a cross section of a further modification, in which themounting rail is pivotable about a horizontal axis which is disposedabove the drive shaft; while FIGURE 9 shows a cross section of stillanother modification, in which the mounting rail forms a part of thefront housing of the spindle drive.

Referring to the drawings, the one-spindle belt drive as illustrated inFIGURE 1 comprises a drive shaft 1 which is mounted in antifrictionbearings in bearing housings 2 which are secured to the spindle rail 3.Angular brackets 4 which are preferably made of steel plate are securedto the lower web of spindle rail 3 and support the longitudinal mountingrail 5 which is bolted to these brackets. Mounting rail 5 carries agroup of slideways 6 for the individual tension pulleys 8, for example,for six to twelve spindles. Due to the resilience of the plastic ofwhich these slideways 6 are made, they are securely clamped to but easilslidable along the mounting rail 5. The pulley holders 7 for the tensionpulleys 8 are inserted into the slideways 6 so as to be slidabletherein. The belt-tightening means consist of springs 9 which areconnected at one end to the pulley holders 7 and at the other end toeyes 10 on the slideways 6. The guide pulleys 11 which are associatedwith each belt are rotatably mounted on brackets 12 which are secured toa separate rail 13 which, in turn, is secured to the bearing housings 2.The arms of each bracket 12 have an extension 12 which carries a pivotpin 14 on which a belt-lifting device is mounted, the rocking lever 15of which is indicated in FIGURE 1 in dot-and-dash lines.

In FIGURE 1a, the arm 12" is screwed onto the rail of the slideway 5which bears the pivot 14 about which the rocking lever 15' is pivotal bymeans of of the operating rod 15" for arresting the spindle movement bylifting the band off the driving disk.

In FIGURE 2, the bearing housings 22 have arms 22' integrally connectedthereto, for example, by being cast in one piece. These arms 22 carrythe mounting rail 25 of steel plate which is bent over at an angle atits upper and lower sides. This mounting rail 25 carries thetensionpulley holders 27 which are directly slidable thereon and arepressed upon rail 25 by springs 29 which extend through apertures 251 inrail 25 and obliquely thereto and are connected to pins 210 on the lowerend of rail 25. Upon the upper web 25' of rail 25 the brackets 212 areadjustably bolted which carry the guide pulleys 213 and also the pivots214 for the devices for stopping the spindles.

FIGURE 3 illustrates a mounting rail 35 which is bolted to the brackets32 of the bearing housings 32, and it also shows parts of the adjacentmounting rails 35 and 35". These mounting rails are provided withelongated apertures 351 or recesses 352. Each mounting rail of thisembodiment extends across twelve spindles and it is secured to thebrackets 32' after each third and ninth spindle. The couplings 31'between the adjacent shaft sections 31 are also disposed within the sameplane as the abutting ends of the adjacent mounting rails. This permitseach mounting rail together with the belt guiding means thereon and theshaft bearings and the shaft sections with the drive pulleys thereon tobe assembled so as to form a single structural unit.

In the further embodiment of the invention as illustrated in FIGURES 4and 5, the tension-pulley holders 47 which are slidable on the mountingrail and are pressed against it by the tension springs 49 are pivotablymounted on rivets 471 with crowned shanks. Springs 49 which again extendobliquely to the surface of rail 45 on which the pulley holders 47 areslidable are hooked at one end into the projecting lugs 49 on the pulleyholders and at the other end into the angle iron 410 which is secured tothe mounting rail 45.

In the embodiment according to FIGURE 6, the mounting rail whichconsists of the upper longitudinal part 65 and the lower longitudinalpart 65 is bolted to the arms '62 of the bearing housings 62. Bymounting the two parts of the rail at a distance from each other, thetension spring 69 may extend obliquely between them from one to theopposite side where it is hooked into the end of the angle 610 on thelower longitudinal part 65. This lower part is provided with verticalslots through which the mounting boits are inserted. When the latter areloosened, the lower part 65 may be adjusted in the vertical directionwhereby the tension of the springs may be varied.

According to FIGURE 7, the arms 72' which are integral with the bearinghousing 72 are provided on their lower ends with a shaft 721 on whichhinge members 722 are pivotably mounted. On these hinge members 722 themounting rail 75 is secured so as to be slidable thereon so that rail 75may be adjusted to different inclinations. Rail 75 carries pins 751 towhich one end of springs 752 are connected which are connected at theother end to the arms 72. Arms 72 are provided with contact surfaces 723for the mounting rail 75. When the springs 752 are unhooked and thebelts are taken off, the mounting rail 75 together with thetension-pulley holders which are secured thereto may be pivoted awayabout shaft 721 so that the spindles will then be easily accessible. Themounting rail also carries brackets 712 which support a shaft 713 onwhich means for stopping the spindle are pivotably mounted.

According to the modification of the invention as shown in FIGURE 8, thebearing housings are provided with pivot pins 821 on which the arms 822are suspended which carry the mounting rail which is adjustable thereonto different elevations and to be bolted thereto in the adjustedposition. Arms 822 are secured to the rigid arms 82 on the bearinghousing 82 by a screw connection which may be easily loosened so thatthereafter the mounting rail 85 together with the tension-pulleysupports 87 may be swiveled outwardly and upwardly on the arms 822 whilethe belts remain on all of their driving and guiding means. The tensionsprings then compensate the changes in position of the tension-pulleysupports on their slideways.

In the further embodiment of the invention as illustrated in FIGURE 9,the mounting rail forms a part of the box which encloses the spindledrive, and it is screwed upon the spindle rail 93. Thetension-pulleyholders 97 are pressed upon their common slideway on rail95 by the tension of the springs 99 which extend obliquely to the planeof the slideway.

Although our invention has been illustrated and described with referenceto the preferred embodiments thereof, we wish to have it understood thatit is in no Way limited to the details of such embodiments, but iscapable of numerous modifications within the scope of the appendedclaims.

Having thus fully disclosed our invention, what we claim is:

1. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley for the relatively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a slideway for each holder, said holder beingslidably mounted on said slideway, tension-producing means connected toeach of said holders, said holders being slidably pressed upon saidslideways by the tension of said belts and the tension exerted by saidtension-producing means, and a common mounting rail extending in thelongitudinal direction of the machine for supporting the slide-ways of agroup of a certain number of said tension pulley holders, said commonmounting rail extending approximately parallel to a plane extendingthrough the part of the driving belt directed from the drive pulley tothe tension pulley in the longitudinal direction of the machine.

2. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley for the relatively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a mounting rail extending in the longitudinaldirection of the machine and forming slideways for a group of a certainnumber of said tension-pulley holders so as to permit said tension-pulleholders to slide on said rail, and tension-producing means connected toeach of said tension-pulley holders and to said rail for pressing saidtension-pulley holder upon said rail.

3. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley for the rela tively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys and each of said guide pulleys having a holder, a mounting railextending in the longitudinal direction of the machine and formingslideways for a group of a certain number of said tension-pulley holdersso as to permit said tension-pulley holders to slide on said rail,tension-producing means connected to each of said tension-pulley holdersand to said rail for pressing said tension-pulley holder upon said rail,and means for securing said guide-pulley holders to said rail.

4. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley for the relatively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a mounting rail extending in the longitudinaldirection of the machine and forming slideways for a group of a certainnumber of said tension-pulley holders so as to permit saidtension-pulley holders to slide on said rail, tension-producing meansconnected to each of said tension-pulley holders and to said rail forpressing said tension-pulley holder upon said rail, a second mountingrail separate from said first rail extending in the longitudinaldirection of said machine, and means for securing a group of said guidepulleys corresponding to said group of tension pulleys by means of theirholders to said second mounting rail.

5. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley for the relatively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a mounting rail extending in the longitudinaldirection of the machine and forming slideways for a group of a certainnumber of said tension-pulley holders so as to permit saidtension-pulley holders to slide on said rail, tension-producing meansconnected to each of said tension-pulley holders and to said rail forpressing said tension-pulley holder upon said rail, and means alsomounted on said rail for stopping said spindles.

6. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley for the relatively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a mounting rail extending in the longitudinaldirection of the machine and forming slideways for a group of a certainnumber of said tension pulley holders, means for pivota-bly connectingsaid holders so as to permit said holders to pivot slidably on said railalong a circular path, and tension-producing means connected to each ofsaid holders and to said rail for pressing said holder upon said rail.

7. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley tor the relatively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of saidtensionpulleys having a holder, a mounting rail extending in the longitudinaldirection of the machine and forming slideways for a group of a certainnumber of said tension-pulley holders so as to permit said holderstoslide on said rail, said rail having apertures, and tension-producingmeans connected at one end to each of said holders at one side of saidrail and extending obliquely to said rail through said apertures to theother side of said rail and connected at the other end to said rail atsaid other side thereof for pressing said holder upon said rail.

8. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley for the relatively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a mounting rail extending in the longitudinaldirection of the machine and forming slideways for a group of a certainnumber of said tension-pulley holders so as to permit said holders toslide on said rail, said rail being divided into a plurality oflongitudinal parts parallel to and spaced from each other and disposedabove each other, tension-producing means connected at one end to eachof said holders and at the other end to the lower longitudinal part ofsaid rail, and means for adjusting said lower part relative to the upperparts of said rail for varying the strength of said tension-producingmeans.

9. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley for the relatively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a mounting rail extending in the longitudinaldirection of the machine and forming slideways for a group of a certainnumber of said tension-pulley holders so as to permit said holders toslide on said rail, said rail being divided into a plurality oflongitudinal parts parallel to and spaced from each other and disposedabove each other, tension-producing means connected at one end to eachof said holders at one side of said rail and extending obliquely to saidrail through the space between the upper and lower parts of said railand connected at the other end to the lower longitudinal part of saidrail, and means for adjusting said lower part relative to the upperparts of said rail for varying the strength of said tension-producingmeans.

10. In a belt drive for the spindles of a spinning or twisting machinehaving a drive shaft extending in the longitudinal direction of themachine, a separate drive pulrley for the relatively short belt of eachspindle mounted on said drive shaft and closely adjacent to saidspindle, bearings for rotatably mounting said shafts, a housing forsupporting each of said bearings, at least one guide pulley and atension pulley for each of said belts, each of said tension pulleyshaving a holder, a mounting rail extending in the longitudinai directionof the machine and secured to said bearing housings and formingslideways for a group of a certain number of said holders so as topermit said holders to slide on said rail, and tension-producing meansconnected to each of said holders and to said rail for pressing saidholder upon said rail.

11. In a belt di'ive for the spindles of a spinning or twisting machinehaving a drive shaft extending in the longitudinal direction of themachine, a separate drive pulley for the relatively short belt of eachspindle mounted on said drive shaft and closely adjacent to saidspindle, bearings for rotatably mounting said shafts, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a mounting rail extending in the longitudinaldirection of the machine and forming slideways 'for a group of a certainnumber of said holders so as to permit said holders to slide on saidrail, tension-producing means connected to each of said holders and tosaid rail for pressing said holder upon said rail, and means formounting said rail so as to be pivotable about a substantiallyhorizontal axis disposed underneath said drive shaft.

12. In a belt drive for the spindles of a spinning or twisting machinehaving a drive shaft extending in the longitudinal direction of themachine, a separate drive pulley for the relatively short belt of eachspindle mounted on said drive shaft and closely adjacent to saidspindle, bearings for rotatably mounting said shafts, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a mounting rail extending in the longitudinaldirection of the machine and forming slideways for a group of a certainnumber of said holders so as to permit said holders to slide on saidrail, tension-producing means connected to each of said holders and tosaid rail for pressing said holder upon said rail, and means formounting said rail so as to be pivotable about a substantiallyhorizontal axis disposed above said drive shaft, said last means beingdisposed in a position so that, when said rail is pivoted upwardly, saidbelts will not be substantially displaced from said drive, tension andguide pulleys.

13. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley for the relatively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a slideway for each holder, said holder beingslidably mounted on said slideway, tensionproducing means connected toeach of said holders, said holders being slidably pressed upon saidslideways by the tension of said belts and the tension exerted by saidtension-producing means, a common mounting rail extending in thelongitudinal direction of the machine for supporting the slideways of agroup of a certain number of said tension-pulley holders, and means forconnecting said mounting rail for said group of slideways and saidtension-pulley holders and tension producing means associated with saidgroup to each other so as to form one structural unit adapted to beinstalled in and removed from the machine as a unit.

14. In a belt drive for the spindles of a spinning or twisting machinehaving a drive shaft extending in the a: longitudinal direction of themachine and divided into a plurality of shaft sections, coupling meansfor connecting the adjacent shaft sections to each other, a group ofspindles associated with each shaft section, a group of drive pulleyscorresponding to the number of spindles of each group mounted on eachshaft section, each of said drive pulleys located closely adjacent toits associated spindle, at least one guide pulley and a tension pulleyassociated with each drive pulley, a relatively short belt connectingsaid pulleys for each spindle, each of said tension pulleys and guidepulleys having a holder, a plurality of mounting rails extending in thelongitudinal direction of the machine adjacent to each other, each ofsaid rails having a length substantially corresponding to the length ofone of said shaft sections and forming slideways for said tension-pulleyholders of each group so as to permit said tension-pulley holders toslide on said rail, tension-producing means connected to each of saidtension-pulley holders and to said rail for pressing said tension-pulleyholder upon said rail, means for connecting said guide-pulley holders ofeach group to said rail, bearing means for one shaft section connectedto said rail, and means for connecting said rail and said pulleyholders, tension-producing means, bearing means and shaft section ofeach group to each other so as to form one structural unit adapted to beinstalled in and removed from the machine as a unit.

15. In a belt drive for the spindles of a spinning or twisting machinehaving a separate drive pulley for the relatively short belt of eachspindle mounted closely adjacent to said spindle, at least one guidepulley and a tension pulley for each of said belts, each of said tensionpulleys having a holder, a mounting rail extending in the longitudinaldirection of the machine and forming slideways for a group of a certainnumber of said pulley holders so as to permit said group of tensionpulley holders to slide on said rail, tension-producing means connectedto each of said holders, said holders being slidably pressed upon saidslideways by the tension of said belts and the tension exerted by saidtension-producing means, and a boxlike housing at least partly enclosingsaid group of holders and the drive guide and tension pulleys andtension-producing means associated with said group, said mounting railforming a part of said housing,

References Cited in the file of this patent UNITED STATES PATENTS2,869,317 Schurr et al. Jan. 20, 1959 2,953,894 Stahlecker et a1. Sept.27, 1960

1. IN A BELT DRIVE FOR THE SPINDLES OF A SPINNING OR TWISTING MACHINEHAVING A SEPARATE DRIVE PULLEY FOR THE RELATIVELY SHORT BELT OF EACHSPINDLE MOUNTED CLOSELY ADJACENT TO SAID SPINDLE, AT LEAST ONE GUIDEPULLEY AND A TENSION PULLEY FOR EACH OF SAID BELTS, EACH OF SAID TENSIONPULLEYS HAVING A HOLDER, A SLIDEWAY FOR EACH HOLDER, SAID HOLDER BEINGSLIDABLY MOUNTED ON SAID SIDEWAY, TENSION-PRODUCING MEANS CONNECTED TOEACH OF SAID HOLDERS, SAID HOLDERS BEING SLIDABLY PRESSED UPON SAIDSLIDEWAYS BY THE TENSION OF SAID BELTS AND THE TENSION EXERTED BY SAIDTENSION-PRODUCING MEANS, AND A COMMON MOUNTING RAIL EXTENDING IN THELONGITUDINAL DIRECTION OF THE MACHINE FOR SUPPORTING THE SLIDEWAYS OF AGROUP OF A CERTAIN NUMBER OF SAID TENSION PULLEY HOLDERS, SAID COMMONMOUNTING RAIL EXTENDING APPROXIMATELY PARALLEL TO A PLANE EXTENDINGTHROUGH THE PART OF THE DRIVING BELT DIRECTED FROM THE DRIVE PULLEY